MAMMOTH COMPLEX ACQUISITION - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended					6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2010 Mammoth Pacific	Aug. 02, 2010 Mammoth Pacific	Aug. 01, 2010 Mammoth Pacific	Jun. 30, 2011 Mammoth Pacific Minimum acre	Jun. 30, 2011 Mammoth Complex	Jun. 30, 2011 Mammoth Complex
Business Acquisition [Line Items]
Acquired ownership interest						50.00%
Business acquisition purchase price in cash						$ 72,500,000
Ownership interest prior to acquisition							50.00%
Undeveloped federal lands								10,000
Revenues									4,729,000	9,439,000
Net income (loss)	$ 8,133,000	$ (1,437,000)	$ (842,000)	$ 401,000	$ 1,027,000				$ 24,000	$ 432,000